The following are known Action Replay Codes for Final Fantasy IV on Nintendo DS (NDS).

Game ID: YF4E-99358F97

• Infinite Gil
  a20d9ebc 00000000
  020d8288 3b9ac9ff
  d2000000 00000000

Dark Knight Cecil Codes

• Quick Level Up
  a20d9ebc 00000000
  220d6148 000000ff
  d2000000 00000000
• Super Quick Level Up
  a20d9ebc 00000000
  120d6148 0000ffff
  d2000000 00000000
• Instant Max Level
  a20d9ebc 00000000
  020d6148 05f5e0ff
  d2000000 00000000
• Max HP
  a20d9ebc 00000000
  120d614e 0000270f
  120d6154 0000270f
  d2000000 00000000
• Full HP After Battle
  a20d9ebc 00000000
  120d6150 0000270f
  d2000000 00000000
• Full MP After Battle
  a20d9ebc 00000000
  120d6158 0000270f
  d2000000 00000000
• Max MP
  a20d9ebc 00000000
  120d615c 0000270f
  120d6300 0000270f
  d2000000 00000000
• Max Strength
  a20d9ebc 00000000
  220d62fa 00000063
  d2000000 00000000
• Max Speed
  a20d9ebc 00000000
  220d62fb 00000063
  d2000000 00000000
• Max Stamina
  a20d9ebc 00000000
  220d62fc 00000063
  d2000000 00000000
• Max Intellect
  a20d9ebc 00000000
  220d62fd 00000063
  d2000000 00000000
• Max Spirit
  a20d9ebc 00000000
  220d62fe 00000063
  d2000000 00000000

Paladin Cecil Codes

• Quick Level Up
  a20d9ebc 00000000
  220d6308 000000ff
  d2000000 00000000
• Super Quick Level Up
  a20d9ebc 00000000
  120d6308 0000ffff
  d2000000 00000000
• Instant Max Level
  a20d9ebc 00000000
  020d6308 05f5e0ff
  d2000000 00000000
• Max HP
  a20d9ebc 00000000
  120d630e 0000270f
  120d6314 0000270f
  d2000000 00000000
• Full HP After Battle
  a20d9ebc 00000000
  120d6310 0000270f
  d2000000 00000000
• Full MP After Battle
  a20d9ebc 00000000
  120d6318 0000270f
  d2000000 00000000
• Max MP
  a20d9ebc 00000000
  120d631c 0000270f
  120d64c0 0000270f
  d2000000 00000000
• Max Strength
  a20d9ebc 00000000
  220d64ba 00000063
  d2000000 00000000
• Max Speed
  a20d9ebc 00000000
  220d64bb 00000063
  d2000000 00000000
• Max Stamina
  a20d9ebc 00000000
  220d64bc 00000063
  d2000000 00000000
• Max Intellect
  a20d9ebc 00000000
  220d64bd 00000063
  d2000000 00000000
• Max Spirit
  a20d9ebc 00000000
  220d64be 00000063
  d2000000 00000000

Kain Codes

• Quick Level Up
  a20d9ebc 00000000
  220d64c8 000000ff
  d2000000 00000000
• Super Quick Level Up
  a20d9ebc 00000000
  120d64c8 0000ffff
  d2000000 00000000
• Instant Max Level
  a20d9ebc 00000000
  020d64c8 05f5e0ff
  d2000000 00000000
• Max HP
  a20d9ebc 00000000
  120d64ce 0000270f
  120d64d4 0000270f
  d2000000 00000000
• Full HP After Battle
  a20d9ebc 00000000
  120d64d0 0000270f
  d2000000 00000000
• Max MP
  a20d9ebc 00000000
  120d64dc 0000270f
  120d6680 0000270f
  d2000000 00000000
• Full MP After Battle
  a20d9ebc 00000000
  120d64d8 0000270f
  d2000000 00000000
• Max Strength
  a20d9ebc 00000000
  220d667a 00000063
  d2000000 00000000
• Max Speed
  a20d9ebc 00000000
  220d667b 00000063
  d2000000 00000000
• Max Stamina
  a20d9ebc 00000000
  220d667c 00000063
  d2000000 00000000
• Max Intellect
  a20d9ebc 00000000
  220d667d 00000063
  d2000000 00000000
• Max Spirit
  a20d9ebc 00000000
  220d667e 00000063
  d2000000 00000000

Enable X Menu Options

• Party Option Always Enabled
  a20d9ebc 00000000
  220d04aa 00000000
  d2000000 00000000
• Settings Option Always Enabled
  a20d9ebc 00000000
  220d04ab 00000000
  d2000000 00000000
• Quick Save Anywhere
  a20d9ebc 00000000
  220d04ac 00000000
  d2000000 00000000
• Save Anywhere
  a20d9ebc 00000000
  220d04ad 00000000
  d2000000 00000000